Which means they are sane, not controlled by the Saudis. Impeachment is for "high crimes and misdemenors", not policy, however horrible. Operation Fast and Furious might be legal grounds for impeachement if he could be proven to have OKed it, but politically it would never happen, and might get him reelected in a sympathy backlash.
It’s widely believed mistakenly that impeachment is like a criminal trial. There is no list of impeachable crimes. If that is what is is they would have made one. “Misdemeanor” can mean minor crimes or simply “misbehavior.” Gerald Ford wrote an opinion in the 1970’s that Congress can impeach and convict for just about any reason they want. You never know, if it is possible if people are too timid (or corrupted) to advocate it. That said, waging war without a mandate, arming drug bandits and not enforcing DOMA all seem quite impeachable. There is value in asserting the truth, whether you think the Senate will convict or not. People that advocate not mentioning these things are really just boot-licks and appeasers IMHO.